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PLUS COMBIWALL HUNG GAS BOILER FORCENTRAL HEATING SUPPLY

Please Read Instructions CarefullySave for Future Reference

— Do not store or use gasoline or other fl ammable vapors and liquids in the vicinity of this or any other appliance.

— WHAT TO DO IF YOU SMELL GAS• Do not try to light any appliance.• Do not touch any electric switch; do not use any phone in your

building.• Immediately call your gas supplier from a neighbor’s phone. Fol-

low the gas supplier’s instructions.• If you can not reach your gas supplier call the fi re department.

— Installation and service must be performed by a qualifi ed installer, service agency or the gas supplier.

WARNING: If the information in this manual is not followed exactly, a fi re or explosion may result causing property dam-age, personal injury or loss of life.

Quincy Hydronic Technology, Inc.3560 Lafayette RoadBldg. 2, Unit APortsmouth, NH 03801Phone: 603-334-6400Fax: 603-334-6401

2 RIVA PLUS COMBI MANUAL

Dear Customer:

Thank you for buying a Biasi Riva Plus Combi.

The Riva Plus Combi is a high effi ciency condensing, wall mounted gas boiler which provides central heat supply water.

We realize that it is not possible to answer all questions about the Riva Plus Combi system in this manual. Reading this installation manual does not make the reader an expert in all aspects of installation and operation, and does not replace the need for a qualifi ed, licensed heating contractor. We urge you to contact your installing contractor or distributor if you are in question about any aspect of your boiler’s performance. Our main concern is that you are satisfi ed with your boiler and its performance. We require that your contractor complete effi ciency tests using instruments.

The external controls and accessories listed in this manual (excluding those supplied inside the boiler) are intended to serve as guidelines rather than specifi c recommendations. We re-alize that other makes and models of such devices are available and can be used as suc-cessfully as those we specify. The installing contractor is the best judge of a system’s specifi c requirements, as well as the local availability of certain makes and models of controls and accessories. The preceding does not apply, however, to the equipment that comes with every boiler, such as the overheat control and pressure relief valves. The installation of the spe-cifi c devices supplied with every boiler is absolutely necessary to the safe operation of the boiler and protection of the heating system.

All BIASI wall hung boilers are built in accordance with the ASME boiler and pressure vessel code, and bear the “H” stamp. The Entire range of applications for the Riva Plus Combi has been tested to standard CSA 4.9 and is CSA compliant.

This Riva Plus Combi has a 2 year warranty, a copy of which is provided with the boiler. Please be sure to return the warranty registration card as the warranty will be void without your boiler’s serial numbers (located on the ratings label affi xed to the boiler), date of installation and the name of your installer being on record in our fi les.

Thank you for purchasing our Riva Plus Combi. If you have questions or comments, please don’t hesitate to contact us immediately. Our goal is 100% customer satisfaction.

QHT inc.

RIVA PLUS COMBI MANUAL 3

Table of Contents

Section Title Section Number Page Number

Warnings - 5-6Important Information - 7General Information 1 8Technical Information (M135.30CM) 2 8-9Parts List 3 10Internal Piping and Parts List 4 11Electric Diagrams 5 12

Sequence of operation 5.1 13Installation Location 6 14Exhaust Pipe Location 7 15Mounting Bracket 8 16Venting 9 17-24

Restrictor Sizing 9.1 19Fitting the Flue System 9.2 19Choice of Flue 9.3 20-23

Pipe Connections 10 24Gas Pipe Connections 11 25Electrical Connections/Wiring 12 26-27

Power Connection 12.1 26Connection to the Electricity Supply 12.2 26Room Thermostat Connection 12.3 27Relay Panel Control Connection 12.4 27Zone Valve Microswitch Connection 12.5 28Finishing 12.6 28

Circulator Sizing 13 29Circ. Cap. as a Function of Flow Rate 13.1 29Expansion Vessel 13.2 29

Piping 14 30-33


Table of Contents

Section Title Section Number Page Number

Primary-Secondary with Zone Valves 14.2 32Manifold Piping with Zone Valves or Circ. 14.3 33

Commissioning 15 34-40Initial Filling of the System 15.1 34Lightning the Boiler 15.2 34Checking the Gas Pres. at the Burner 15.3 35Adjustment of the Gas Pressure 15.4 36Checking the Ignition Device 15.5 36Checking the Burner Ignition 15.6 37Adjustment of the Useful c.h. Output 15.7 37Labels Placement 15.8 37Checking the Flue System and Comb. 15.9 38Instructing the User 15.10 39

Gas Conversion 16 40Annual Maintenance 17 41-43

Warnings 17.1 41Dismantelling the External Panels 17.2 41Emptying the C.h. System 17.3 41Emptying the D.h.w.circuit 17.4 42Cleanig the Burner. 17.5 42Checking the combustion fan 17.6 42Checking the Flue 17.7 42Checking the press. in the exp.vassel 17.8 43Visual Inspection of Appliance 17.9 43Gas Pressures and Soundness 17.10 43Cleanig the primary heat exchanger 17.11 43Cleanig the domestic hot water exchanger 17.12 43Condensate trap 17.13 43

Vent Part Spares 18 44-46Installer Notes 19 47


WARNINGBoiler is certifi ed as an indoor appliance. Do not install boiler outdoors or locate where it will be exposed to freezing temperatures.

— Do not store or use gasoline or other fl ammable vapors and liquids in the vicinity of this or any other appliance.

— WHAT TO DO IF YOU SMELL GAS• Do not try to light any appliance.• Do not touch any electric switch; do not use any phone in your build-

ing.• Immediately call your gas supplier from a neighbor’s phone. Follow the

gas supplier’s instructions.• If you can not reach your gas supplier call the fi re department.

— Installation and service must be performed by a qualifi ed installer, ser-vice agency or the gas supplier.

WARNING: If the information in this manual is not followed exactly, a fi re or explosion may result causing property dam-age, personal injury or loss of life.

DANGERCaution: Do not store or use fl ammable materials, chemicals or fl ammable liquids, especially gasoline, in the vicinity of this heating appliance.

Caution: Should overheating occur or the gas supply fail to shut off, do not turnoff or disconnect the electrical supply to the pump. Instead, shut off the gassupply at a location external to the appliance.

Caution: Do not use this boiler if any part has been under water. Immediatelycall a qualifi ed service technician to inspect the boiler and to replace any part ofthe control system and any gas control which has been under water.


WARNINGAny appliance that burns natural gas, propane gas, fuel oil, wood or coal is capable of pro-ducing carbon monoxide (CO). Carbon Monoxide (CO) is a gas which is odorless, colorless and tasteless but is very toxic. CO is lighter than air and thus may travel throughout the building.

BRIEF EXPOSURE TO HIGH CONCENTRATIONS OF CO, ORPROLONGED EXPOSURE TO LESSER AMOUNTS OF CO MAY

RESULT IN CARBON MONOXIDE POISONING. EXPOSURE CAN BEFATAL AND EXPOSURE TO HIGH CONCENTRATIONS MAY RESULT

IN THE SUDDEN ONSET OF SYMPTOMS INCLUDINGUNCONSCIOUSNESS.

Symptoms of CO poisoning include the following: dizziness vision problems shortness of breath headache loss of muscle control unclear thinking nausea weakness unconsciousness

The symptoms of CO poisoning are often confused with those of infl uenza, and the highest incidence of poisoning occurs at the onset of cold weather or during fl u season.A victim may not experience any symptoms, only one symptom, or a few symptoms.Suspect the presence of carbon monoxide if symptoms tend to disappear when you leave your home.

The following signs may indicate the presence of carbon monoxide:

• Hot gasses from appliance, venting system pipes or chimney, escaping into the living space.

• Flames coming out around the appliance.• Yellow colored fl ames in the appliance.• Stale or smelly air.• The presence of soot or carbon in or around the appliance.• Very high unexplained humidity inside the building.

If any of the symptoms of CO occur, or if any of the signs of carbon monoxide arepresent, VACATE THE PREMISES IMMEDIATELY AND CONTACT A QUALIFIEDHEATING SERVICE COMPANY OR THE GAS COMPANY OR THE FIREDEPARTMENT.

ONLY QUALIFIED, LICENSED SERVICE CONTRACTORS SHOULD PERFORMWORK ON YOUR BIASI RIVA COMBI BOILER.


IMPORTANT INFORMATIONPlease read this page carefully.

• ALL BOILERS MUST BE INSTALLED IN ACCORDANCE WITH NATIONAL, STATE AND LOCAL PLUMBING, HEATING AND ELECTRICAL CODES AND ORDINANCES, AS WELL AS THE REGULATIONS OF THE SERVING ELECTRICAL, WATER AND GAS UTILITIES.

• All systems should be designed by competent contractors, and only persons knowledgeable in the layout and installation of heating systems should attempt the installation of any boiler. It is the responsibility of the installing contractor to see that all controls are correctly installed and operating properly when the installation is completed.

• This boiler is intended for use, only with propane or natural gas. All fl ammable liquids (especially gasoline), chemicals, rags, paper, wood scraps, debris, etc., should be kept away from the boiler at all times. Keep the boiler area clean and free of all fi re hazards.

• Please read the literature and warranties supplied by the manufacturers of the various accessory equipment. This equipment is warranted by the respective manufacturers, not by Quincy Hydronic Technologies, Inc. Each piece of equipment must be installed and used according to the recommendations of the manufacturer.

Codes and Regulations:Installation of the boiler and related equipment must conform to national, state and local regulating agencies and codes applicable to the installation of the equipment. In the absence of local requirements, the following codes apply:

A. ANSI/NFPA - #70 National Electric Code B. ANSI/NFPA - #211 Chimneys and Vents C. ANSI/NFPA - #Z223.1 National Fuel Gas Code C. ANSI/NFPA - Domestic Gas Conversion Burner D. CAN/CGA - B149 Installation Codes E. ANSI/ASME - CSD-1

The above codes are available from:

National Fire Protection Association (NFPA) CSA InternationalBattery March Park 8501 E. Pleasant Valley RoadQuincy, Massachusetts, 02269 Cleveland, OH 44134-5575http://www.nfpa.org http://www.csa-international.org


1. General Information

2. Technical Information (M135.30CM)

The Riva Plus Combi is a high effi ciency condensing, wall mounted gas boiler which provides central heat. The boiler features a gas valve which modulates the energy input from 49,476 BTU/h to 116,008 BTU/h. The boiler is shipped fully assembled with the components listed on page 11. All units are pressure and combustion tested at the factory prior to shipping.

Key Features:

• Wall mountable - saving valuable fl oor space.

• Several fl ue options available• Electronic spark ignition• Safety fl ow switch - positioned on the

main circuit, which monitors the fl ow and protects the main heat exchanger from thermal shock should there be a lack of water in the system.

• Frost protection - contains an integral frost protection system to prevent frost dam-age which can occur in areas susceptible to very cold weather conditions.

• Boiler operation recognition system - should the boiler not be used for longer than 24 hours, it then performs a con-trolled system test to ensuring the motor-ized components within the boiler do not become inoperable due to lack of use.

• Gas valve modulation - the gas input modulates based off central heating tem-perature to within ± 2 ºF

• Diagnostic information system equipped with three LED diagnostic lights for quick error assessment.

GENERALHeight in 31.6Width in 15.7Depth in 13.8Weight lb 109.5

ELECTRICALVoltage V 120Frequency Hz 60Current A 1.6Power consumption W 180

INJECTORS No. SizeNatural 14 130Propane 14 89

CENTRAL HEATINGMaximum working temp. °F 185Temp. Regulation range* °F 100-176Maximum pressure psi 30.0Minimum pressure psi 4.35Max head loss (at 4.4 GPM) ft 8.25*At the minimum useful output


2. Technical Information Cont.

ENERGY CAPACITYNominal heat input (0/2000ft) MBH 116.0

Nominal heat input (2000/4500ft) MBH 110.2

Minimum heat input MBH 49.5

Maximum useful output (0/2000ft) MBH 102.0

Maximum useful output (2000/4500ft) MBH 97.2

Minimum useful output MBH 41.6

GAS SUPPLY PRESSUREGas Normal Min MaxNatural inwc 7.0 3.5 10.5Propane inwc 11.0 8.0 13.0

GAS PRESSURE AT BURNERGas Min Max IgnitionNatural inwc 1.0 4.8 2.4Propane inwc 2.0 10.3 5.2

FLUE DESIGNMinimum Venturi pressure inwc 0.64Flue pipe diameter

Coaxial in 2.25/4 3.25/5Twin split pipes in 3.25/3.25Nominal heat fl ow rate (0/2000ft) MBH 116.0

Nominal heat fl ow rate (2000/4500ft) MBH 110.2

Min Exhaust temperature °F 140

Max Exhaust temperature °F 180

GAS FLOW RATEGas Min MaxNatural ft³/h 48.7 115.1Propane lb/h 2.2 5.2

CLEARANCE TO COMBUSTIBLESFront in 18Back in 0Top in 8Sides in 2Bottom in 8Flue pipe enclosed in 2Flue pipe free air in 0Hot water pipes in 1”

FLUE GAS FIGURESGas Min MaxCO2 2.5% 6.3%O2 16.5% 9.7%

DOMESTIC HOT WATERMaximum temperature °F 131

Minimum temperature °F 95

Maximum pressure psi 145

Minimum pressure psi 4.35

D.h.w. ΔT 45 F (25 C) gpm 4.5D.h.w. ΔT 54 F (30 C) gpm 3.8D.h.w. ΔT 63 F (35 C) gpm 3.2D.h.w. ΔT 72 F (40 C gpm 2.8


3. Parts ListPrimary Components:

1 Pump2. Pump vent plug3. Automatic air purger valve4. Modulation gas valve5. Flame-detecting electrode6. Ignition electrodes7. Burner8. Combustion chamber9. Primary heat exchanger10. Fan11. Air pressure switch12. Air switch pres. Test points13. Safety thermostat14. Modulation operator15. Gas valve outlet pres. Test point16. Gas valve inlet pres. Test point17. Central heating expansion vessel18. Central heating temp. Probe NTC19. Central heating pressure relief valve20. Primary circuit fl ow switch21. Main circuit drain cock

22. By-pass valve23. Three-way diverter valve24. Venturi device25. Flue outlet pipe26. Air Intake Pipe27. Control panel28. Safety thermostat probe29. Pressure reducing automatic fi ll valve30. Backfl ow preventer31. Gas supply line cock32. Water supply inlet cock33. Condensate trap34. Condensing heat exchanger35. Flue termostat36. D.h.w heat exchanger 37. D.h.w fl ow switch38. Domestic water circuit fi lter39. D.h.w fl ow limiter40. Domestic hot water temp.probe NTC41. Domestic cold water inlet valve42. D.h.w. outlet pipe


4. Internal Piping & Parts List

Note: Pressure Relief Valve (#19) should be piped to a drain or to the fl oor as lose as pos-sible to a drain.


5. Electric Diagrams


Is primary circuit temp higher

than selected temp

Request for heat from thermostat

Circulator offIgnition device off

Starts the circulatorSupplies the ignition device

YES

NO YES

NO

Is the boiler in lockout?

Air pressure switch open?

Fan starts

Air pressure switch closed?

Begin wait period

Presence of flame?

Air pressure switch closed?

Starts ignitorsOpens gas valve

Begins ignition timing

Flame presence?

Closes gas valveStops fan

Interrupts ignitorBoiler lockout

End of ignition period?

Interrupt igniterGas valve open

Reset push – button pressed

Flame presence?

Safety thermostat Opens the circuit?

Flame presence?

Close gas valve

NOYES

YESNO

NO

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

5. Electric Diagrams Cont.5.1 Sequence of Operation


6. Installation LocationThe installation location chosen must:• Comply with all clearances listed below.• Provide suitable location for the exhaust and intake venting.• Not be installed in an unheated space.• Comply with all local codes and standards.Note: Dimensions shown are minimums. Greater clearances will simplify installation

and service.

Figure 6.1

WARNING: Do not install the boiler on carpeting

If the boiler is to be installed in an enclosed room with no fresh air intake, the room must have proper vent louvers installed. There should be two louvers, place each within 12” of the ceiling and fl oor respectively. Each vent will have a free area of 54 square inches.

8.0 in

27.7 in

12.8 in

3.0 in

18.0

2.0 in

15.8 in

10.0 in

2.0 in CLOSET INSTALLATION

MINIMUM PERMANANT

CLEARANCE

FRONTV ISWEI DE VIEW CLOSET

INSTALLATION

CLOSET INSTALLATION

SERVICECLEARANCE

Figure 6.2 When choosing an installation location insure the exhaust and intake pipes comply with NFPA 54. The drawing on the next page illustrates the restrictions on exhaust locations.

Note: For boilers in an enclosed space it is recommended to install a CO detector in the boiler room.


7. Exhaust Pipe Location

CAUTIONEXTERNAL VENT SURFACES ARE HOT.

IT IS RESPONSABILITY OF THE HOMEOWNER TO KEEP THE VENTTERMINAL CLEAR OF SNOW AND ICE

NOTE: USE ONLY LISTED COMPONENTS SUPPLIED WITH THE BOILER.SURFACE DISCOLORATION OF THE BUILDING MAY OCCUR DUE TO

IMPROPER INSTALLATION. QHT WILL NOT ACCEPT RESPONSIBILITY ORLIABILITY FOR SUCH DISCOLORATION.

C - 12 in. minimum 12 in. minimum3 ft. minimum

12 in. minimum12 in. minimum

The Exhaust Hood must be installed on the leeward side of house and conform to the following guidelines:

1. The Vent hood shall not be less than 3 feet above any forced air inlet to the house. 2. The Vent hood shall not be less than 1 feet below, 1 feet horizontally, or 1 foot above any

door, window or gravity inlet into any building.3. The Vent hood shall not be less than 2 feet from an adjacent building.4. The Vent hood shall be not less than 7 feet above grade when located adjacent to public walkway.5. The Vent hood shall be located so that fl ue gasses are not directed to jeopardize people,

overheat combustible structures, materials or enter buildings.6. Minimum of 4 feet horizontal clearance from electric meters, gas meters, regulators and relief

equipment.7. All joints in system are to be sealed to prevent leakage of products of combustion in

the building.8. Avoid installing exhaust hood on the North, West, or the side of the house receiving the

prevailing winds.9. The vent should not be situated so that the fl ue gases are directed towards brickwork,siding, or other

construction , in such a manner that may cause damage from heat or condensate from the fl ue gases


8. Mounting BracketAfter a suitable installation location is chosen, verify that the mounting wall is properly braced and strong enough to support the 110 pound weight of the unit when fi lled with water. NOTE: The boiler shall be installed such that the gas ignition system components are

protected from water and liquids in general (dripping,spraying, rain, etc) during the appliance operation and service.

Use the paper template provided with the boiler to determine the location of the mounting bracket. Securely mount the bracket to the wall using appropriate hardware for the particular wall construction. Mounting Steps:1. Tape the paper template to the wall in the chosen location. Be sure to level the

template.2. Pre-drill two holes in the center of the “oval” slots on the mounting bracket, sized for

the hardware being used.3. Mount the bracket to the wall. Be sure to level the bracket by adjusting the screw in

the vertical slot.4. Pre-drill the remaining hole in the mounting bracket and secure the fi nal screw.5. Mark and drill the exhaust/intake pipe holes through the house. If you are using a

coaxial pipe system, drill the hole marked A (ø 4”) in the drawing below and on the paper template. If you are using a separate pipe system drill holes marked B and C (ø 3.25”) shown below as well as on the paper template.

6. Remove paper template and hang boiler on bracket.

Figure 8.1


9. VentingThe Riva Plus Combi is a mechanical draft, side wall vented boiler. There are two side wall fl ue options available – separate and coaxial. The coaxial option has one confi guration shown on the next page. The separate option has two possible confi gurations shown on the follow-ing pages. There is also a vertical roof venting option. Regardless of what vent kit is installed, they should all conform to the Provisions for combustion and ventilation air in accordance with section 5.3, Air for Combustion and Ventilation, of the National Fuel Gas Code, ANSI Z223.1, or Sections 7.2, 7.3 or 7.4 of CAN/CGA B149, Installation Codes, or appli-cable provisions of the local building codes.

If the Biasi Riva Plus Combi replaces a boiler that was attached to a common vent system, the common venting system is likely to be too large for proper venting of the appliances remaining connected to it. To ensure the remaining appliances will function properly, the test procedure below should be followed:

At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.(a) Seal any unused openings in the common venting system.(b) Visually inspect the venting system for proper size and horizontal pitch and determine

there is no blockage or restriction, leakage, corrosion and other defi ciencies which could cause an unsafe condition.

(c) Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fi replace dampers.

(d) Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.

(e) Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the fl ame of a match or candle, or smoke from a cigarette, cigar or pipe.

(f) After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fi replace dampers and any other gas-burning appliance to their previous condition of use.” (g) Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA B149, Installation Codes. When resizing any portion of the common venting system, the common venting system should be resized to approach the mini-mum size as determined using the appropriate tables in Part 11 of the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA B149, Installation Codes.


The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00and 5.00 for installation of through – the – wall vented gas appliances as follows:(a) For direct-vent appliances, mechanical-vent heating appliances or domestic hot water equipment, where the bottom of the vent terminal and the air intake is installed below four feet above grade the following requirements must be satisfi ed:

1. If there is not one already present, on each fl oor level where there are bedroom(s), a carbon monoxide detector and alarm shall be placed in the living area outside the bedroom(s). The carbon monoxide detector shall comply with NFPA 720 (2005 Edition).

2. A carbon monoxide detector shall be located in the room that houses the appliance or equipment andshall:

a. Be powered by the same electrical circuit as the appliance or equipment such that only one service switch services both the appliance and the carbon monoxide detector;

b. Have battery back-up power;c. Meet ANSI/UL 2034 Standards and comply with NFPA 720 (2005 Edition);andd. Have been approved and listed by a Nationally Recognized Testing Laboratory as recognized

under 527 CMR.3. A Product-approved vent terminal must be used, and if applicable, a Product-approved air intake must be used. Installation shall be in strict compliance with the manufacturer’s instructions. A copy of the installation instructions shall remain with the appliance or equipment at the completion of the installation.

4. A metal or plastic identifi cation plate shall be mounted at the exterior of the building, four feet directly above the location of vent terminal. The plate shall be of suffi cient size to be easily read from a distance of eight feet away, and read “Gas Vent Directly Below”.(b) For direct-vent appliances, mechanical-vent heating appliances or domestic hot water equipment where the bottom of the vent terminal and the air intake is installed above four feet above grade the following requirements must be satisfi ed:

1. If there is not one already present, on each fl oor level where there are bedroom(s), a carbon monoxide detector and alarm shall be placed in the living area outside the bedroom(s). The carbon monoxide detector shall comply with NFPA 720 (2005 Edition).

2. A carbon monoxide detector shall:a. Be located in the room that houses the appliance or equipment;b. Be either hard-wired or battery powered or both; andc. Shall comply with NFPA 720 (2005 Edition).

3. A Product-approved vent terminal must be used, and if applicable, a Product-approved air intake must be used. Installation shall be in strict compliance with the manufacturer’s instructions. A copy of the installation instructions shall remain with the appliance or equipment at the completion of the installation.

9. Venting Requirements for the State of Massachussetts


9. Venting Cont.The Riva is a mechanical draft, side wall vented boiler. There are two fl ue options available - separate and coaxial. The coaxial option has one confi guration shown on the next page. The separate option has two possible confi gurations shown on the following pages.

9.1 Restrictor Sizing:Each exhaust option is shipped standard with 3 feet of exhaust pipe, 3 feet of in-take air pipe. There is also a restrictor kit in which there are some restrictors that must be placed in exhauset breech of fan on the top of the boiler (Fig. 9.1) accor-ding to the fl ue confuguration used.If additional fl ue piping is needed for a particular application, it can be ordered separately in 3 foot increments. Dependin on th efi nal fl ue pipe lenght, an alter-native restrictor may be required. Refer to the tables 9.1 for proper restrictor ring sizing.

Separate 3.25/3.25 Restrictor SizeFrom 3.30 to 49.2 ft (in+out) 45

From 49.2 to 99 ft (in+out) No restrictor

Coaxial 2.5/4.0 Restrictor SizeFrom 0 to 2.9 ft 82

From 2.9 to 9 ft No restrictor

Table 9.19.2 Fitting the fl ue system:

In general, it has to be taken in consideration that the horizontal section of the fl ue pipe must have a slope not less than .3 inches per foot towards the boiler.In the standard horzontal fl ue kit the fl ue pipe is angled with in the air duct therefore the air duct must be horizontally installed. If one or more exstensions have to be used they must be adequately supported so that there is no sag in the fl ue pipe and a minimum fall of .3 inches per foot toward the boiler is ensured.


9. Venting Cont.9.3 Choice of fl ue:

The following fl ue kits are available for connecting to the boiler:

A Standard coaxial horizontal fl ue kit (Exhaust & intake outside)

Figure 9.3 (Coaxial 2.4/4.0 inches – nominal lenght 3.3 ft)

It can be fi tted to allow discharge to the rear or either side of the boiler via the fl anged boiler adapter elbow. Minimum lenght required is 2.9 ft. Maximum equivalent lenght of 8.8 ft can be achieved utilising extensions. This fl ue system can only be used to discharge horizontally, it is not designed to enable termination in the vertical plane.

Installation:• Drill hole A (on the wall template) through the outside wall that is less than 18”thick.• Cut the pipe as necessary so that a no more than 6” protrudes from the house.• Slide the intake and exhaust pipes through the hole.• Slide one rubber wall trim piece on the pipe from inside and one from outside.• Connect exhaust (inner) pipe to concentric elbow.• Connect intake (outer) pipe to concentric elbow.• Secure elbow to boiler using gasket and four screws provided.• Secure end cap on the intake pipe outside the house.


9. Venting Cont.B Standard separate horizontal fl ue kit (Exhaust & intake outside)

Figure 9.4 (Twin pipe Ø 3.25 in)

Various twin (split) pipes kits and optional accessories (elbows) are available to assist in the termination of the fl ue where the boiler is installed in a location remote to an outside wall. These kits allow for separation of the air supply pipe from the pipe that discharges the exhaust gasses. Consequently it is possible to extend the fl ue system to a greater distance than that provided by the standard coaxial horizontal fl ue.If either an additional 45° or 90° accessory elbow is used then the maximum permissible lenght of either pipe must be reduced by 3.0 ft or 5.4 ft respectively. The sum of the lenghts of the two horizontal part must be less than 49.2 ft.

Installation:• Drill holes B & C (on the wall template) through the outside wall that is less than

18”thick.• Cut the pipes as necessary so that no more than 6” of intake pipe protrudes from the

house and the exhaust pipe is a minimum of 4 inches longer than the intake pipe.• Slide the Intake and exhaust pipes through the respective holes.• Slide one rubber wall trim piece on each pipe from inside and one from outside.• Attach each collar to the boiler with the gasket and screws provided.• Insert each elbow into its corresponding collar.• Connect each pipe to its corresponding elbow (as shown in the diagram).• Secure end cap on the intake and exhaust pipe outside the house


E Alternative separate kit (Exhaust & intake outside)

Figure 9.7 (Twin Pipe Ø 3.25 in)

These kits allow for separation of the air supply pipe from the pipe that discharges the exhaust gasses. Consequently it is possible to extend the fl ue system to a greater distance than that provided by the standard coaxial horizontal fl ue.If either an additional 45° or 90° accessory elbow is used then the maximum permissible lenght of either pipe must be reduced by 3.0 ft or 5.4 ft respectively. The sum of the lenghts of the two horizontal part must be less than 49. ft.

Installation:• Drill holes B & C (on the wall template) through the outside wall Drill hole C (on the wall

template) through the outside wall that is less than 18”thick.• Cut the pipes as necessary so that no more than 6” of intake pipe protrudes from the

house and the exhaust pipe is a minimum of 4 inches longer than the intake pipe.• Slide the Intake and exhaust pipes through the respective holes.• Slide one rubber wall trim piece on each pipe from inside and one from outside.• Attach each collar to the boiler with the gasket and screws provided.• Insert each elbow into its corresponding collar.• Connect each pipe to its corresponding elbow (as shown in the diagram).• Secure end cap on the intake and exhaust pipe outside the house.

9. Venting Cont.


9. Venting Cont.F Standard Vertical-roof kit (Exhaust & intake outside)

Figure 9.8 (vertical pipe Ø 3.1 / Ø 4.9 in)

This kit allows vertical termination of the fl ue pipe through the roof. The kit is 1.2 min length. Extension pieces (Co--axial) are also available which allows the fl ue system to be extended to a total overall maximum permissible length.Optional 45° and 90° elbows can be used to offset the fl ue route.Each additional elbow reduces the overall acceptable length of the fl ue system as follows:45° reduce length by 1.6 ft.90° reduce length by 3.2 ft.

Installation:• Drill hole through the outside roof.• Cut the pipe as necessary.• Slide the intake and exhaust pipes through the hole.• Slide one rubber wall trim piece on the pipe from inside and one from outside.• Connect exhaust (inner) pipe to concentric elbow.• Connect intake (outer) pipe to concentric elbow.• Secure elbow to boiler using gasket and four screws provided.• Secure end cap on the intake pipe outside the house.


10. Pipe ConnectionsThe Riva Plus Combi is supplied with a 3/4” stainless steel gas pipe (A in fi gure 10.1), 2 - 3/4” copper pipe (C,D in fi gure 10.1), 2 - 1/2” (F,G in fi gure 10.1) located in a plastic bag in the boiler package.

Figure 10.1

E F

G

A) Stainless steel gas pipeB) Main circuit drain cockC) C.h. supply copper pipeD) C.h. return copper pipeE) D.h.w. outlet pipeF) D.h.w. inlet pipeG) Condensate trap

Installation:• Remove the protective caps off boiler connections (Figure 10.1).• Thoroughly clean the connections.• Attach the supplied components to the boiler connections (see Figures 10.1). Be sure to

use the proper gaskets for the pipe connections. The pressure relief valve is attached to the stand pipe located in the top left rear corner of the boiler.

• Attach the condensate trap to an appropriate drain pipe.• Before connecting the boiler to the heating system piping, review the suggested piping dia-

grams in Section 4 (page 11).• If the c.h. system is above the boiler level, it is advisable to install c.h. cocks close to the

boiler for servicing operation• A hot water boiler installed above radiation level or as required by the Authority having juris-

diction, must be provided with a low water cutoff device elther as part of the boiler or at the time of boiler installation.

Condensate trap:The condensate trap allows the discharge of the condensate via the condensate drain pipe avoiding in the mean timethe escape of combustion products. A plastic ball closes the trap outlet in case that the trap is empty. The condenste trap is provided with two electrodes: if the drain pipe is plugged or in any case in which the condensate isn’t correctly evacuated, the conden-sate level in the trap rises putting in contact the electrodes thus causing the boiler lock-out.


11. Gas Pipe ConnectionsGas supply piping is to be sized and installed properly in order to provide a supply of gas suffi -cient to meet the maximum demand without undue loss of pressure between the meter and the boiler. Consult with the National Fuel Gas Code ANSI Z223.1 for proper sizing of gas piping for various lengths and diameters.La Chaudière doit être isolée du système de la tuyauterie de la fourniture du gaz en fermant son robinet d’arrêt durant n’importe test de pression du système de la tuyauterie de la fourni-ture du gaz en présence de pressions d’essai égales ou inférieures à 1/2 psi (3.5 kPa).

Figure 11.1

A) Manual T-handle Shutoff ValveB) Pressure Gauge PortC) Flexible Gas Line to BurnerD) Male Union ¾” NPTE) Pipe CapF) 1” X 1” X ¾” TEE

Note: Height of valve above ground level to conform to local codes, if any. Massa-chusetts statecode requires gas shut off to be a tee handled gas cock.

Locate a drop pipe adjacent to, but not in front of the boiler. Locate a tee (F) in the drop pipe at the same elevation as the gas inlet connection to the boiler. Extend the drop line with a nipple towards the fl oor and cap to form a sediment trap (E). Install a shut off valve (A) before the tee with sediment trap and a union after the tee before the combination gas valve (D).When installing the boiler, make sure a pipe compound resistant to the action of liquefi ed pe-troleum is used. Check piping for leaks. Always check leaks with a water and soap solution.The boiler and its gas connection must be leak tested before placing the boiler in operation.The boiler and its individual shut-off valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of ½ psi(3.5 kPa).

WARNINGSDO NOT USE A FLAME FOR CHECKING GAS LEAKS.


12. Electrical Connections/Wiring

Figure 12.1 Removing Front Panel:• Remove the front panel by

removing screws A and slid-ing the front panel up and away from the boiler

Removing Side Panel:• Remove screws B

Figure 12.2 Removing Service Panel:• Remove screws C.

Figure 12.3

• Move the lower part of the side panels (fi gure 12.3).

• Pull the control panel. When completely pulled out, the panel can rotate 45° down-ward.

Figure 12.4 • Loosen screws D and re-

move the service panel (Fig. 12.4)

12.1 Power Connection:

For the electrical connection to the boiler use electric wires which conform to local regulations.The boiler, when installed ,must be electricallybonded to ground in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements,with the National Elec-trical Code,ANSI/NFPA 70 and/or Canadian Electrical Code Part I CSA C22.1, Electrical Code.Aux États-Unis, garder un espace d’au moins 4 pieds horizontalement du terminal d’évacuation aux compteurs du gaz, compteurs de l’électricité, régulateurs et équipement d’évacuation. Au Canada, garder un espace de 6ft entre le terminal d’évacuation et ces dispositifs.

12.2 Connection to the electricity supply:• Connect the electrical supply cable coming from the fused spur isolation switch to the power supply

terminal block of the boiler (as shown in fi gure 12.5) keeping the same connections for the live wire and the neutral wire.

Figure 12.5

WARNINGNote: Do not connect live wires to

thermostat terminals 1-3.


12. Electrical Connections/Wiring Cont.12.3 Room Thermostat Connection:

• The room thermostat must be connected to the terminal block situated next to the control panel.

Figure 12.6 • Any external controls and connection

lines must be rated at 120 VAC but un-der no circumstances should external live voltage be connected to the control termi-nal block on the boiler.

12.4 Relay Panel Connection:

• When connecting any type of external control, the jumper J in Fig. 12.6 must be removed.

• The room thermostat must be connected to the “Control Terminal Block” (Fig 12.7).

Figure 12.7 • Connect the room thermostat between

terminals 1 and 3 as shown in Fig. 12.7.

• The relay control must be connected to the terminal block situated next to the control panel.

Figure 12.8 • When connecting any type of relay con-

trol, the jumper J in Fig. 12.8 must be re-moved.

• Connect the dry contact switch of the re-lay panel to the 120 VAC control terminal block (Fig 12.9).

Figure 12.9 • Connect the dry contact switch to termi-

nals 1 and 3 shown in Fig. 12.9.


12. Electrical Connections/Wiring Cont.12.5 Zone Valve Micro Switch Connection:

• The zone valve micro switch must be con-nected to the terminal block situated next to the control panel.

Figure 12.10

• When connecting the zone valve switch, the jumper J in Fig. 12.10 must be re-moved.

Figure 12.11

• Connect the micro switch of the zone valve to terminals 1 and 3 as shown in fi g-ure 12.11

• Connect the zone valve switch to the room thermostat as shown in fi gure 12.11

12.6 Finishing

• Route the electrical supply cord and the external control cord as illustrated in Fig. 12.12.

Figure 12.12

• Lock the cords in place with the fl exible cord clamps.• Replace the control panel reversing the steps on page 23.


13. Circulator Sizing

13.1 Circulator capacity as a function of fl ow rate:

Figure 13.1

The hydraulic specifi cation in Fig 13.1 represent the pressure (available head for the central heating system) as a function of the fl ow rate. The pressure loss due to the in-ternal piping in the boiler has already been substracted.

When determining proper piping of the heating system, verify that the internal boiler circulator will overcome the head loss of the system at the designed fl ow rate using the graph above.If the internal circulator is adequate, direct system piping can be utilized. See section 4 page 12 for suggested direct supply/return piping.If the internal circulator is inadequate, a secondary circulator must be utilized. See sections 14 for suggested primary/secondary piping.

13.2 Expansion vessels:The height difference between the C.h. PRV (19 on page 11) and the highest point in the sys-tem may be 23 ft at most. For greater differences, increase the pre-load pressure in the C.h. expansion vessel (17 on page 11) and the system when cold, by 0.1 bar for additional 3.3 ft. For systems with volumes greater than 154l, an additional expansion vessel must be provided.


14. PipingAll external piping components are to be supplied by the installer. It is very important to use a Primary Secondary piping scheme when an external circulator will be used. Also, when the boiler is piped in a primary secondary manner, it is necessary to us the central heating fl ow restrictor supplied with the boiler. The fl ow restrictor ensures that there will be enough back pressure to make the central heating fl ow switch in a low head loss piping system like primary secondary.

Installation of fl ow restrictor: The fl ow restrictor is installed inside the pipe tail that attaches to the boiler. Place the fl ow restrictor into the gasket for the central heating supply pipe tail. Place the gasket on the pipe tail so the fl ow restrictor seats into the pipe tail. Then install the pipe tail onto the boiler. There are two methods for accomplishing a Primary Secondary piping system. The fi rst is to use two closely spaced tees for the boiler supply and return. An example is shown below in Figure 14.1. The run legs should be sized so that there is no excessive head loss on the exter-nal circulator that is installed. In most circumstances 1 ¼” piping will be the best choice. When the boiler is piped in this way, the external circulator will not have any hydraulic effect on the Riva Plus Combi. This is essential to ensure that the fl ow switch will operate properly.

Figure 14.1

The second method is a hydraulic separator. Hydraulic separators are available commercially; however you can also construct your own. An example of a hydraulic separator is given in Figure 14.2. It is important that the separator be at least 2” in size to ensure proper performance.

Figure 14.2


14.1 Primary – Secondary Piping:

All external piping components are to be supplied by the installer.It is very important to use an hydraulic separator before secondary circulators.All external piping components are to be supplied by the installer.It is very important to use a hydraulic separator before secondary circulators.

Figure 14.3

14. Piping Cont.


14.2 Primary – Secondary Piping with Zone Valves:

All external piping components are to be supplied by the installer.It is very important to use a hydraulic separator before secondary circulators.

Figure 14.4

14. Piping Cont.


14.3 Manifold Piping with Zone Valves (shown conn. to radiators):

All external piping components are to be supplied by the installer.

Figure 14.5

14. Piping Cont.


15. Commissioning15.1 Initial fi lling of the system:

• Remove the front panel of the case.• Unscrew the cap on the automatic air

purger valve 3 (Fig 15.1) one full turn and leave open permanently.

Figure 15.1 • Open the installer supplied automatic fi ll

valve between the cold water inlet and Central Heating System (See 28 on pip-ing diagrams in previous section).

• Open each radiator air vent starting at the lower point and close it only when clear water, free of bubbles, fl ows out.

• Purge the air from the pump by unscrew-ing the pump plug 2 (Fig. 15.2); release the pump by turning the rotor in the direction indicated by the arrow on the information plate.

Figure 15.2 • Close the pump plug.• Continue fi lling the system. The actual

reading should ideally be 1.3 bar (19 psi) and not less than 0.3 bar (4.3 psi).

• Close all air release valves on the c.h. system.

• Inspect the boiler and the system for water soundness and remedy any leaks discovered.

• Cold fl ush the system to remove any loose particles and any system debris be-fore starting the boiler for the fi rst time.

• Reassemble the front panel of the case.• Return fi ll valve to automatic position.

15.2 Lighting the boiler:Note: If external controls are fi tted (e.g. room thermostat) ensure they “call for heat”.

THE BOILER AND ITS GAS CONNECTION MUST BE LEAK TESTED BEFORE THE BOILER IS PLACED IN OPERATION

• Turn on the electricity supply to the boiler, switching on the circuit breaker switch. The ap-pliance operation light A will fl ash every 4 seconds.

• Turn the function selector B as in Fig. 15.3. The appliance operation light A will fl ash every 2 seconds.

Figure 15.3

WARNINGS


15. Commissioning Cont.The boiler will now go through an ignition sequence and the burner will light.If during the ignition attempt period the boiler fails to light, the full sequence control p.c.b. will go to lockout and the lock-out signal lamp E will appear.To reset the boiler turn the knob C (fi gure 15.3) on the 0 position and then press and release the boiler reset button D (Fig. 15.3).

15.3 Checking the gas pressure at the burner:This boiler has been tested to the highest quality control standards.The maximum and minimum gas pressures are already set during this quality control process however the checking procedure must be followed to ensure maximum operat-ing effi ciency from the boiler.

• Remove the front panel of the case.• Take off the lid of the sealed chamber.• Loosen the internal screw 15 (Figure 15.4)

on the Outlet Pressure Test Point of the Gas Valve and connect a pressure gauge using a suitable hose.

Figure 15.4 • Set the c.h. temperature control knob to its

maximum position. If external controls are fi tted (e.g. room thermostat) ensure they “call for heat”.

• Switch on the boiler.• Check the maximum gas pressure and com-

pare the value on the gauge with the value indicated in the Section 2 on page 10 (gas pressures at the burner).

• Check the maximum gas fl ow at the gas meter and compare the value indicated in the section 2 on page 10 (gas fl ow rate).

• Switch off the boiler.• Disconnect the gas modulator coil by remov-

ing the electrical connector E (Figure 15.4).• Switch on the boiler.• Check the minimum gas pressure and com-

pare the value on the gauge with the value indicated in the Section 2 on page 10 (gas pressures at the burner).

• Switch off the boiler and re-connect the electrical connector E to the modulator coil.

• Switch on the boiler.• Check that the boiler lights up uniformly.• Switch off the boiler, turn off the hot water

taps and disconnect the pressure gauge.• Close the lid of the sealed chamber.

Important: after the checks all of the test points must be sealed.


15. Commissioning Cont.15.4 Adjustment of the gas pressure:

• Remove the front panel of the case.• Take off the lid of the sealed chamber.• Open the gas valve inlet pressure test

point (16 in Fig. 15.5) at the valve input, connect a suitable pressure gauge and check the gas pressure of the supply net-work.

• Remove the gauge and close the pres-sure test point 16.

• Open the gas valve outlet pressure test point (15 in Fig. 15.5) and connect the gauge.

•

Figure 15.5 • Remove the protection cap I (Fig. 15.7)

from the mechanical pressure adjustment components levering with a fl at screw-driver in the slots H.

• Start the boiler at its maximum power.

Figure 15.6 • Ensure that the boiler is not range rated.• Rotate the maximum gas pressure adjust-

ment (F in Fig. 15.5) until you obtain the required pressure (by rotating clockwise the pressure increases).

• Turn the boiler off and disconnect one of the two connectors (E in Fig. 15.5).

• Start the boiler and rotate the minimum gas pressure adjustment (G in Fig. 15.5) until you obtain the required pressure (by rotat-ing clockwise the pressure increases).

• Turn the boiler off and re-connect the wire to the modulating operator.

• Start the boiler and check again the maxi-mum gas pressure setting.

• Turn the boiler off and disconnect the gauge.

• Close the lid of the sealed chamber.


15.5 Checking the ignition device:With the burner on high fl ame close the gas cock. After three ignition attempts (within about three minutes), the lock-out signal lamp must appear (D on Figure 15.3). To reset the boiler turn the knob B (fi gure 15.3) on the 0 position and then press and release the boiler reset but-ton (C on Figure 15.3).


15. Commissioning Cont.15.6 Checking the burner ignition:

• Turn the boiler OFF.• Open the gas valve outlet pressure test point

15 (fi gure 15.5) and connect the gauge.• Turn the boiler ON positioning the function

selector B in the position shown in fi gure 15.7 and ensure that the room thermostat is set to “heat demand”.

Figure 15.7 • Loosen screws D and remove the service

panel (fi gure 15.8).

Figure 15.8 • Watch the gauge and check to see if the

ignition pressure registerd corresponds to the values given in the Technical Data. Turn off the boiler and reignite it by turning the function selector B to the 0 position and then back to that indicated in fi gure 15.7.

• Repeat this process two to three times

leaving 30 second intervals between each ignition. Check the ignition pressures and visually check that the burner lights uni-formly and in a controlled manner.

• To carry out the adjustment move the function selector 3 to the OFF position (Fig. 15.9) and use the device (ACC).

Figure 15.9 • Adjust the gas pressure at the injectors to

the value indicated in the tables of section 2. By rotating the device clockwise the pressure increases.

• After the adjustment operations bring the selector 3 of fi gure 15.9 back to the nor-mal position (ON).

• Reassemble the service panel.• Close the gas valve outlet pressure test

point 15 (fi gure 15.5).• Reassemble the front pannel of the case.


15.7 Adjustment of the useful c.h. output:• Turn the boiler OFF.• Open the gas valve outlet pressure test point 15 (fi gure 15.5) and connect the gauge.• Turn the boiler ON positioning the function selector B in the position shown in fi gure 15.7

and ensure that the room thermostat is set to “heat demand”.• Loosen screws D and remove the service panel (fi gure 15.8).• To carry out the adjustment use the adjustment device (RISC) with the help of a screwdriver.• By rotating the device clockwise the pressure increases.• Adjust the gas pressure at the burner to the value according to the useful c.h. output wanted (Tab. 15.1).• Reassemble the service panel.• Close the gas valve outlet pressure test point 15 (fi gure 15.5).• Reassemble the front pannel of the case.


15. Commissioning Cont.

15.8 Labels placement:

Figure 15.10

Warning: The installation is not complete unless labels supplied are placed on the boil-er as shown in Figure 15.10.

All the labels supplied with the boiler are numbered for reference.According to Figure 15.10 place all the labels on the boiler. Use label numbered as 1 (already installed in the front panel) to begin the placement in the correct way.


15. Commissioning Cont.15.9 Checking the fl ue system and combustion:

• The fl ue system should be visually checked for soundness. Check all clamps, gaskets and fi xings are secure and tight.

• Ensure that the fl ue terminal is sited cor-rectly in accordance with the fl ue fi tting instructions.

To check the exhaust gas:• Remove the plugs indicated (Fig. 15.11).• Insert the analyzer probe in the exhaust

gas sampling point or in the air intake sampling point.

• Reference tables are given in the Sec-tions 2 on page 10 of this manual for proper CO2 levels.

Figure 15.11

15.10 Instructing the user:• Hand over the User manual, this Installation,Operation and Service manual to the end user

and explain how to use the unit in Central Heating mode.• Take the User step by step through the lighting instructions.• Show the User how to switch off the appliance quickly and indicate the position of the elec-

tric service switch and the boiler on/off switch.• Explain the proper use and adjustment of all system controls; this will ensure the greatest

possible safety and fuel economy.• Explain the function and use of the function switch.• Explain how to turn off the appliance for both short and long periods and advise on the pre-

cautions necessary to prevent damage should the appliance be inoperative when freezing conditions may occur.

• Fill in the details required on the Boiler Guarantee Certifi cate and hand to the User advis-ing them to return the correct section for boiler Guarantee registration. Finally, advise the User that, for continued safe and effi cient operation, the appliance must be serviced by a competent person at least once a year.

Useful outputKW 14 16 18 20 22 23.5 25 27

BTU/h 49000 55500 62000 68000 74500 80500 86500 93500

NaturelPa

inwc.2901.16

3701.48

4601.84

5602.24

6602.65

7803.13

9003.61

10404.17

m³/h 1.76 2.00 2.23 2.46 2.69 2.91 3.14 3.36ft³/h 5.77 6.56 7.31 8.07 8.82 9.54 10.30 11.02

PropanePa

inwc.6801.45

8601.69

10602.25

12703.21

15004.34

17405.62

20007.06

22708.95

Kg/h 1.3 1.5 1.7 1.9 2.0 2.2 2.3 2.5lb/h 3.0 3.3 3.7 4.1 4.4 4.8 5.1 5.5

Table 15.1


16. Gas Conversion

WARNINGS: Procedures to adapt the boiler to the type of gas available must be car-ried out by a competent and responsible person. Components used to adapt it to the type of gas available must be genuine parts only.

Procedures:• Check that the gas cock (30 on Section

4) fi tted on the gas supply pipe is turned off and the appliance is switched off at the circuit breaker.

• Remove the front and side panels of the case (see the section 17.2 Annual Main-tenance – Dismantelling the External Panels).

• Take off the lid of the sealed chamber.• Remove the front panel of the combustion

chamber.

Figure 16.1 • Loosen the screws A and remove the

burner 7 (Figure 16.1).• Carry out the conversion for the type of

gas, replacing the burner injectors cor-rectly.

• Re-assemble the burner, the front panel of the combustion chamber and the lid of the sealed chamber.

• Extract the control panel as explained in the section 12.1 of this manual.

• Loosen the screws D and remove the ser-vice panel (fi gure 16.2)

Figure 16.2 • Set correctly the dip-switch “2” to the cor-

rect position (Fig. 16.3) in accordance with the following table.

Gas supply Position of the switch 2Natural gas On

L.P.G. Off

Figure 16.3 • Close the service panel.• Turn on the boiler.• Calibrate the gas valve according to the

instructions given in section 15.4 of this manual.

• Set the correct gas pressure for central heating output required.

• Stick on the inside of the left hand side panel adjacent to the data badge the self-adhesive label (included with the conver-sion kit) indicating the type of gas, and the gas pressures to which the appliance has been set.

• Reassemble the front and side panels of the case.


17. Annual Maintenance

17.1 Warnings:The procedures detailed in this chapter must be carried out only by a professionally qualifi ed person. Thus you are advised to contact an Authorised Service Agent.For effi cient and continuous operation of the boiler you are advised to have, at least once a year, maintenance and cleaning done by an Approved Service Person.Isolate the appliance from the electricity supply by turning off the fused spur isolation switch adjacent to the appliance and turn off the gas cock, before carrying out any procedures, what-soever, for cleaning, maintenance, opening or dismantling boiler panels.

17.2 Dismanteling the external panels:Front Panel:• Loosen the three screws A (Fig. 17.1)• Lift and remove the panel.Side Panels:• Loosen the screws B (Figure 17.2). Bring the bottom of the panels away from the boiler and

lift them, freeing them from the top hooks.• Take off the front panel of the case, then the sealed chamber lid and the front panel of the com-

bustion chamber.If you notice dirt on the fi ns of the primary heat (9 on page 10), cover the slop-ing surfaces of the burner (7 on page 10) entirely in a protective layer (sheets of newspaper or similar). Brush out the primary heat exchanger (9 on page 10) with a bristle paintbrush.

Figure 17.1 Figure 17.2

• Close the pressure reducing automatic fi ll valve (28 on Section 4)

• Open the central heating drain cock (F in Fig. 17.3).

• Empty the c.h. system.• Close the central heating drain cock (F in

Fig. 17.3).• Open the pressure reducing automatic fi ll

valve (28 on Section 4) Figure 17.3

17.3 Emptying the d.h.w. system:


17. Annual Maintenance Cont.17.4 Emptying the Domestic Hot Water circuit

• Close the inlet valve• Open the system domestic hot water valves

17.5 Cleaning the primary heat exchanger:

17.6 Checking the combustion fan:

The combustion fan does not require any special maintenance. Lubrication is not necessary due to the fact that the ball bearings are sealed. Check that the fan operates and that the vis-ible impeller fi ns are free of any dirt or obstructions.

17.7 Checking the fl ue:Have the integrity of the fl ue outlet pipe (24 on page 11) air intake pipe (25 on page 11), checked periodically, the venturi device (23 on page 11) cleaned and the effi ciency of the fl ue safety circuit checked at least once a year. For all the above maintenance operations it is ad-visable to call an approved Service Engineer.• Remove the four Phillips head screws from the vent connector on the boiler.• Remove the vent connector from the boiler by pulling vertically on it.• Remove the fi rst elbow from the horizontal run of the exhaust to the outside.• Using a fl ashlight inspect each length of vent pipe for obstructions and dirt buildup. Clean

any that is found with an appropriate sized brush.• Inspect the venture device inside the outlet of the combustion fan. Make sure that it is free

of any dirt build up or blockage. • Make sure the seals are properly seated in the female ends of the vent pipe with the fi ns

facing the male end of the pipe. • Reinstall the elbow onto the horizontal run of the pipe fi rst by simply pushing the parts together. • Push the vent adapter down onto the top of the boiler and reinstall the four Phillips head

screws.

Follow the instructions for removing the ex-ternal panels from 17.2. Remove the nine screws labelled C in fi gure 17.4. Now you will have complete access to the combustion chamber. The sloping and multi-gas type burner (7 on page 11) does not need special maintenance, but it is suffi cient to dust it with a bristle paintbrush.

Figure 17.4


17. Annual Maintenance Cont.17.8 Checking the pressurization in the expansion vessel:

Empty the central heating system as described in section 17.3 of this chapter and check that the pressure in the expansion vessel is not less than 1 bar (14.5 psi). See also section 13.2 of this manual. If the pressure should be lower, take steps to correct the pressure level. To check the pressure at the venturi device, use the test points (12 on page 11).

• Remove the caps of the pressure test points and connect a differential pressure gauge.

• Switch on the boiler• Compare the value on the gauge with the

minimum values of venturi pressure indi-cated in the Section 2 on page 9.

Figure 17.5 17.9 Visual inspection of appliance:

Visually inspect all water joints, seals and connections for any evidence of leakage and re-tighten, grease or replace them as necessary.

17.10 Gas pressures and soundness:Check appliance for gas soundness. Recheck operational pressures and adjust as necessary as described in Section 15.4 page 37 of this manual.

17.11 Cleaning the primary heat exchanger:• Take off the front panel of the case, then the sealed chamber lid and the front panel of the com-

bustion chamber. If you notice dirt on the fi ns of the primary heat exchanger (9 on page 11), cover the sloping surfaces of the burner (7 on page 11) entirely in a protective layer (sheets of newspa-per or similar). Brush out the primary heat exchanger (9 on page 11) with a bristle paintbrush.

17.12 Cleaning the domestic hot water exchanger:The descaling of the domestic hot water exchanger will be evaluated by the Authorised Assis-tance Centre Technician, who will carry out any cleaning, using specifi c products.

17.13 Condensate trap:To clean the condensate trap: • Remove the front and right case panels.• Disconnect the trap from the drain pipe.• Using pliers, remove the spring D moving

it upwards.• Disconnect the wirings from the trap.• Reassemble carrying out the removal op-

erations in reverse order.

The trap should be serviced once a year dur-ing the annual service.

Figure 17.6


18. Vent Part Spares

Figure 18.1

Description Order NumberTwin pipe kit 10999.0393.0

For any spare parts, please contact QHT Inc. at 800-501-7697.


Figure 18.2

Description Order NumberCoaxial fl ue kit 10999.0387.0

18. Vent Part Cont.



Figure 18.3

Part Description Order NumberA Coaxial fl ue kit 10999.0387.0

18. Vent Part Cont.



19. Installer Notes

System Checkout:

Boiler Model No. ___________________

Original Purchaser:___________________________

___________________________

___________________________

Serial No.______________________

Installer:________________________

________________________

________________________

_______________________________________________________________________

Performance Tests:

GROSS STACK TEMPERATURE __________________

ROOM TEMPERATURE (AMBIENT) ________________

NET STACK TEMPERATURE _____________________

CO2 __________________

O2 ___________________

SMOKE READING ___________________

COMBUSTION EFFICIENCY _________________

COMMENTS ___________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

17962.1481.0 3808 (52A4)USA

REV. 1209

riva boiler installation, operation - qht,...

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